CODEWITHSUNDEEP
c#oopclassinheritance
French Boy
French Boy

Reputation: 1491

In a child class, how to get different types for a specific property?

I have the following classes:

class BusinessBase {     }

class BusnessChild: BusinessBase {     }

class VisualBase
{
     BusinessBase BusinessObject {get; set;}
}

class VisualChild: VisualBase
{
    // I'm instantiate an instance of BusinessChild and 
    // assign it to BusinessObject property
}

In every instance visual child there's an object of BusinessChild instance from that appropriate type.

I mean they are BusinessChild1 and BusinessChild2 for VisualChild1 and VisualChild2 and all of them are inherited from VisualBase and BusinessBase.

The question is:

Is there a way to get an instance of BusinessChild from VisualChild without creating a new property in the child class? because I want to deal with all children instances from a parent reference.

What I thought so far is creating a generic method called GetBusinessObject<T> and pass the appropriate business type to it, but I wonder if it can be done automatically in someway (without passing the type).

Please ask me for further information if it's not clear.

Upvotes: 1

Views: 113

Answers (2)

codymanix
codymanix

Reputation: 29468

You could decorate the derived class with a custom attribute:

[BusinessObjectTypeAttribute(typeof(VisualChild))]
class VisualChild: VisualBase
{
    // I'm instantiate an instance of BusinessChild and 
    // assign it to BusinessObject property
}

Then you read out this attribute with GetCustomAttributes() and create the instance with Activator.CreateInstance() and pass the type to it.

Upvotes: 0

Jon Skeet
Jon Skeet

Reputation: 1500385

One obvious approach is to make VisualBase generic:

class VisualBase<T> where T : BusinessBase
{
    T BusinessObject {get; set;}
}

class VisualChild1 : VisualBase<BusinessChild1>
{
    ...
}

Upvotes: 3

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